VFS2000-TF2Z523EN-A
Page 3 of 3
6 Maintenance - continued
•
Do not disassemble the product, unless required by installation or
maintenance instructions.
6.2 Mounting
Caution
Refer to 3.7 for details.
6.3 Maintainable parts
Caution
•
Refer to specific product precautions in catalogue for how to order and
exchange pilot valve.
•
To mount pilot valve to valve body, tighten the M3 mounting screws to
a torque of 0.45 to 0.6 N∙m.
•
Refer to catalogue for how to order light/surge voltage suppressor
substrate, sub-plate assemblies, manifolds, manifold accessory parts
and mounting bolts and gasket.
Warning
•
Body ported VFS1000/2000/3000 and base mounted VFS2000: When
changing rated voltage and electrical entry etc., pilot valve assembly
can be changed. However, in the case of plug-in type with light/surge
voltage suppressor, rated voltage cannot be changed by changing pilot
valve assembly.
•
Base mounted VFS3000/4000/5000/6000: When changing rated
voltage and electrical entry etc., pilot valve assembly can be changed.
However, when changing the rated voltage of a valve with indictor
light/surge voltage suppressor, it is required to change both the pilot
valve and indictor light/surge voltage suppressor substrate, refer to
catalogue for how to access/remove light/surge voltage suppressor
substrate.
7 Limitations of Use
Warning
The system designer should determine the effect of the possible failure
modes of the product on the system.
7.1 Limited warranty and disclaimer/compliance requirements
Refer to Handling Precautions for SMC Products.
Warning
7.2 Effect of energy loss on valve switching
•
The use of 2-position single valves with combined air and spring
returned spools has to be carefully considered.
•
The return of the valve spool into the de-energized position depends
on the pilot pressure. If the pilot pressure drops below the specified
operating pressure the position of the spool cannot be defined.
•
The design of the system must take into account such behaviour.
•
Additional measures might be necessary. For example, the installation
of an additional air tank to maintain the pilot pressure.
Spool position
Single
solenoid
Double solenoid
3 Position
Air supply
present,
electrical
supply cut
Spool at the
end position
Spool
returns to
the OFF
position by
air and
spring force.
Spool holds
position
Spool returns to
the OFF position
by spring force.
During spool
movement
(Spool at
intermediate
position)
Spool stops
moving after
electricity cut
(Position cannot
be defined)
Electrical
supply
present,
air supply cut
Spool at the
end position
Spool
returns to
the OFF
position by
spring force.
Spool holds
position
During spool
movement
(Spool at
intermediate
position)
Spool stops
moving after air
pressure cut
(Position cannot
be defined)
Table 10.
7.3 Intermediate stopping
Refer to Handling Precautions for 3/4/5 port Solenoid Valves.
7.4 Holding of pressure
Since valves are subject to air leakage, they cannot be used for
applications such as holding pressure (including vacuum) in a system.
7 Limitations of Use - continued
7.5 Cannot be used as an emergency shut-off valve
This product is not designed for safety applications such as an
emergency shut-off valve. If the valves are used in this type of system,
other reliable safety assurance measures should be adopted.
Caution
7.6 Safety relays or PLC
If a safe output from a safety relay or PLC is used to operate this valve,
ensure that any output test pulse duration is shorter than 1 ms to avoid
the valve solenoid responding.
7.7 Leakage voltage
Ensure that any leakage voltage caused by the leakage current when the
switching element is OFF causes
≤ 3% (for DC coils) or ≤ 20% (for AC
coils) of the rated voltage across the valve.
7.8 Low temperature operation
Unless otherwise indicated in the specifications for each valve, operation
is possible to -
10˚C, but appropriate measures should be taken to avoid
solidification or freezing of drainage and moisture, etc.
7.9 Momentary energization
If a double solenoid valve is operated with momentary energization, it
should be energized for at least 0.1 second. However, depending on the
secondary load conditions, it should be energized until the cylinder
reaches the stroke end position, as there is a possibility of malfunction
otherwise.
8 Product Disposal
This product shall not be disposed of as municipal waste. Check your
local regulations and guidelines to dispose this product correctly, in order
to reduce the impact on human health and the environment.
9 Contacts
Refer to www.smcworld.com or www.smc.eu for your local
distributor/importer.
URL :
https:// www.smcworld.com (Global) https:// www.smc.eu (Europe)
SMC Corporation, 4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021, Japan
Specifications are subject to change without prior notice from the manufacturer.
© 2022
SMC Corporation All Rights Reserved.
Template DKP50047-F-085M
